Vacuum negative pressure low-temperature distillation system

Abstract

The utility model relates to the field of environmental protection machinery, concretely is a kind of vacuum negative pressure low-temperature distillation system.The utility model includes vacuum distillation kettle, plate heat exchanger, water ring vacuum pump, gas-liquid separator and cooling system;The heat source used by system is the hot water of casting primary cooling line heat recovery, and the whole system works in negative pressure closed state, and there is no gas leakage.Using the hot water recycled by casting cooling line as heat source reduces the consumption of electric energy or steam energy, and the whole system works in negative pressure closed state using water ring vacuum pump, and there is no gas leakage, reduces environmental pollution and energy waste, and the negative pressure closed operation reduces the safety risk in operating process, ensures the safety of operator.Cooling system uses tap water circulation cooling, and the heat generated in cooling process can be heat exchanged again, and hot water returns to heat source storage tank for recycling, which also improves energy utilization rate.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection machinery, specifically a vacuum negative pressure low-temperature distillation system. Background Technology

[0002] Industrial wastewater contains a large amount of toxic and harmful substances, which, if left untreated and uncontrolled, will cause serious damage and pollution to the environment. These pollutants may enter the soil, rivers, and lakes, damaging ecosystems and impacting biodiversity. Reducing wastewater discharge helps protect the ecological environment, maintain ecological balance, and ensure the health of humans and ecosystems. Water resources are precious natural resources; reducing wastewater discharge and reusing wastewater can alleviate water shortages to some extent. By recycling wastewater, the amount of fresh water used can be reduced, improving water resource utilization efficiency.

[0003] The industry reduces wastewater generation at its source by optimizing production processes, improving equipment efficiency, and optimizing circulating cooling water systems. Water-saving equipment and processes can also be adopted to reduce water consumption during production, thereby lowering wastewater discharge. Based on the nature and source of the wastewater, it is categorized for different treatment methods to improve treatment efficiency and reduce costs.

[0004] For waste liquid containing heavy metals, electrolysis, chemical precipitation or ion exchange are used for treatment; for waste liquid containing a large amount of organic matter, biological treatment technology is used for degradation; for acidic and alkaline waste liquid, the pH value is adjusted by neutralization reaction so that the waste liquid meets the discharge standards. Currently, the common treatment technologies have high treatment costs.

[0005] This utility model combines the applicant's waste heat recovery from the casting cooling line with the design of a vacuum negative pressure low-temperature distillation system based on the principle of evaporation. Summary of the Invention

[0006] This invention provides a vacuum negative pressure low-temperature distillation system to solve the problems existing in the prior art.

[0007] The technical solutions adopted in this utility model are as follows:

[0008] A vacuum negative pressure low-temperature distillation system, comprising:

[0009] Vacuum distillation kettle: It has a steam outlet at the top and a waste liquid outlet at the bottom;

[0010] Plate heat exchanger: connected to the steam outlet at the top of the vacuum distillation kettle, it cools down the high-temperature steam and condenses it into water;

[0011] Water ring vacuum pump: connected to a plate heat exchanger, it creates a vacuum inside the system, generating negative pressure;

[0012] Gas-liquid separator: Separates the gas and liquid discharged from the water ring vacuum pump. The liquid enters the water ring vacuum pump, and the gas enters the cooling system.

[0013] Cooling system: connected to the gas-liquid separator and plate heat exchanger, including a water tank and water pump, and externally connected to tap water.

[0014] The waste liquid outlet at the bottom of the vacuum distillation kettle is connected to a sewage pump. Once the pumped waste liquid reaches the set amount, it is discharged into the waste liquid tank, and new waste liquid is added at the same time to form a cycle.

[0015] The vacuum negative pressure low-temperature distillation system is also equipped with a waste bin, and the outlet is connected to a feed pump, which pumps the waste into the vacuum distillation kettle.

[0016] Waste materials undergo pre-filtration before entering the vacuum distillation kettle.

[0017] The gas heated by the vacuum distillation kettle and gas-liquid separator enters the cooling system for cooling. The heat generated during the cooling process is exchanged again, and after being cooled by tap water, it is pumped into the gas-liquid separator and plate heat exchanger for recycling.

[0018] The cooling system uses tap water to circulate and cool down the water. The heat generated during the cooling process is then exchanged again, and the resulting hot water is returned to the heat source storage tank for recirculation and reheating before being used again.

[0019] The heat source used by the system is the hot water recovered from the primary cooling line of the casting plant.

[0020] The entire system operates under negative pressure and in a closed state, with no gas leakage.

[0021] The system maintains a vacuum of -0.099 kPa and an evaporation temperature of 25-40℃.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] Using hot water recovered from the casting cooling line as a heat source reduces the consumption of electricity or steam energy. The entire system operates in a negative pressure closed state using a water ring vacuum pump, preventing gas leakage, reducing environmental pollution and energy waste. Furthermore, the negative pressure closed operation reduces safety risks during operation, ensuring the safety of operators. The cooling system uses circulating tap water for cooling; the heat generated during cooling can be exchanged again, and the hot water returns to the heat source storage tank for reuse, further improving energy efficiency.

[0024] Furthermore, based on the applicant's case studies, the system can save significant outsourcing costs and tap water usage, demonstrating substantial economic benefits. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] The factory generates nearly 100 tons of processing waste liquid every year that needs to be treated. This utility model combines the applicant's waste heat recovery from the casting cooling line and uses the principle of evaporation to design a vacuum negative pressure low temperature distillation system.

[0028] like Figure 1 As shown, the hot water source for the vacuum distillation kettle 2 in this system is generated by heating with heat from the casting cooling line. A vacuum negative pressure low-temperature distillation system is installed. Example

[0029] Specific implementation steps

[0030] Step 1: System Check and Preparation

[0031] Check that all components of the cryogenic distillation system are in good working order, including the vacuum distillation kettle 2, plate heat exchanger 3, water ring vacuum pump 11, gas-liquid separator 4, cooling system, etc.

[0032] Ensure all pipe connections are correct and leak-free.

[0033] Check that the sensors and measuring equipment are calibrated accurately.

[0034] Step 2: System preheating and debugging

[0035] Start the system, preheat to room temperature, and ensure all equipment is functioning properly.

[0036] Adjust the water ring vacuum pump 11 to ensure that the required negative pressure (-0.099kPa) is formed inside the system.

[0037] Step 3: Waste liquid input

[0038] The waste liquid is pumped from the waste container 1 into the vacuum distillation vessel 2 using the feed pump 10.

[0039] Ensure that the waste liquid is pre-filtered before entering the vacuum distillation vessel 2.

[0040] Step 4: Begin the distillation process

[0041] The waste liquid is drawn into the distillation vessel by a feed pump and heated.

[0042] The vacuum pump creates a vacuum inside the system, generating negative pressure. The waste liquid boils, forms steam, and is then discharged.

[0043] Step 5: Steam condensation and liquefaction

[0044] The steam is cooled by the plate heat exchanger 3 and then liquefied back into water before being discharged.

[0045] Step 6: Gas-liquid separation

[0046] The gas-liquid separator 4 separates the gas and liquid discharged from the water ring vacuum pump 11. The liquid flows back to the water ring vacuum pump 11, while the gas enters the cooling system.

[0047] Step 7: Cooling and Circulation

[0048] The cooling system uses tap water to circulate and cool the water, and the heat generated during the cooling process is then exchanged again.

[0049] The generated hot water is returned to the heat source storage tank for recirculation and reuse.

[0050] Step 8: Wastewater Discharge and Replenishment

[0051] The distillation kettle is equipped with an automatic sewage pump 9, which opens to discharge waste liquid into the waste liquid tank 9 after the internal waste liquid reaches the set amount.

[0052] At the same time, new waste liquid is added to form a cycle and continues to evaporate.

[0053] Step 9: Data Recording and Analysis

[0054] Record data such as temperature, pressure, and waste liquid treatment volume during the experiment.

[0055] Analyze energy-saving benefits, such as savings in tap water consumption and reduced outsourced treatment costs.

[0056] Step 10: System shutdown and cleaning

[0057] After the experiment, shut down the system and stop all pumps and heaters.

[0058] Clean the system, in preparation for the next experiment.

[0059] Safety and environmental protection measures

[0060] Ensure the entire system operates under negative pressure and in a closed state, with no gas leakage.

[0061] Regularly check the vacuum level and temperature to ensure the system operates under safe conditions.

[0062] The treated waste liquid and cooling water should meet environmental protection requirements.

[0063] The above steps provide a basic experimental procedure framework. Specific operating parameters and conditions need to be adjusted according to the experimental objectives and requirements. In actual operation, safety and environmental protection measures are also very important considerations.

[0064] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A vacuum negative pressure low-temperature distillation system, characterized in that, include: Vacuum distillation kettle (2): It is equipped with a steam outlet at the top and a waste liquid outlet at the bottom; Plate heat exchanger (3): connected to the upper steam outlet of the vacuum distillation kettle (2) to cool down and condense high-temperature steam into water; Water ring vacuum pump (11): connected to plate heat exchanger (3) to create a vacuum inside the system and generate negative pressure; Gas-liquid separator (4): Separates the gas and liquid discharged from the water ring vacuum pump (11), with the liquid flowing back to the water ring vacuum pump (11) and the gas entering the cooling system; Cooling system: connected to gas-liquid separator (4) and plate heat exchanger (3), including water tank (6) and water pump (5), and external tap water.

2. The vacuum negative pressure low-temperature distillation system according to claim 1, characterized in that, The waste liquid outlet at the bottom of the vacuum distillation kettle (2) is connected to the sewage pump (9). After the pumped waste liquid reaches the set amount, it is discharged into the waste liquid tank (8), and new waste liquid is replenished at the same time to form a cycle.

3. The vacuum negative pressure low-temperature distillation system according to claim 1, characterized in that, The vacuum negative pressure low temperature distillation system is also equipped with a waste tank (1) and an outlet connected to a feed pump (10), which pumps the waste into the vacuum distillation kettle (2).

4. The vacuum negative pressure low-temperature distillation system according to claim 1, characterized in that, Waste is pre-filtered before entering the vacuum distillation kettle (2).

5. The vacuum negative pressure low-temperature distillation system according to claim 1, characterized in that, The heat source used by the system is the hot water recovered from the primary cooling line of the casting plant.

6. The vacuum negative pressure low-temperature distillation system according to claim 1, characterized in that, The cooling system uses tap water to circulate and cool down the water. The heat generated during the cooling process is then exchanged again, and the resulting hot water is returned to the heat source storage tank for recirculation and reheating before being used again.

7. The vacuum negative pressure low-temperature distillation system according to claim 1, characterized in that, The entire system operates under negative pressure and in a closed state, with no gas leakage.

8. The vacuum negative pressure low-temperature distillation system according to claim 1, characterized in that, The system maintains a vacuum of -0.099 kPa and an evaporation temperature of 25-40℃.

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